请问两道语法题~~

1.Reporting that one of its many problems had been the recent extended sales slump in women's apparel,the sever-store retailer said it would start.
A.its many problems had been the recent
B.its many problems has been the recently
C.its many problems is the recently
D.their many problems is the recent
E.their many problems had been the recent
为什么选A而不是B?

2.Unlike transplants between identical twins,whose genetic endowment is the same,all patients receiving hearts or other organs must take antirejection drugs for the rest of their lives.
A.Unlike transplants between identical twins,whose genetic endowment is the same
B.Besides transplants involving identical twins with the same genetic endowment
C.Unless the transplant involves identical twins who have the same genetic endowment
D.Aside from a transplant between identical twins with the same genetic endowment
E.Other than transplants between identical twins,whose genetic endowment is the same
这几个"除了"有什么区别啊?